Provided in a tamping unit for tamping a track are squeezing drives (14) for a squeezing motion of tamping tines. In a hydraulic cylinder (19)having a squeezing piston (17) with a piston rod (18)of the squeezing drive (14), a first pressure chamber (20) for producing the squeezing motion (8) is provided. Additionally arranged is a second pressure chamber (21) for producing an opening motion directed opposite to the squeezing motion, and a third pressure chamber (22) provided for producing vibrations.

A hydraulic vibration generation device is provided. The device includes a manifold member having an inner volume, a fluid inlet orifice and a fluid outlet orifice. The device further includes a vibration generating member having a channel grooved drive and an off-center weight, and bearing retaining plates. The inner volume receives the vibration generating member within the inner volume. The bearing retaining plate that retain bearings operate to retain the vibration generating member within the inner volume in response to coupling the bearing retaining plate to the manifold member wherein two bearings on opposing ends of the vibration generating member are retained within recesses of the bearing retaining plates. The vibration generating member rotates and generates vibration in response to hydraulic fluid flowing into the manifold member through the inlet orifice and out of the manifold member through the outlet orifice.

An implement vibration system and method is disclosed that includes a vibration activation device; an electrohydraulic mechanism and a controller. The controller monitors the vibration activation device and sends movement signals to the electrohydraulic mechanism to control implement movement. When the vibration activation device is activated, the controller sends vibration signals to the electrohydraulic mechanism to cause the implement to vibrate. An operator control can send implement commands where the movement signals are based on the implement commands, and when vibration is activated the controller can superimpose the vibration signals on the movement signals. The vibration signals can cause a hydraulic cylinder to repeatedly extend and retract. An electrohydraulic control valve can receive the movement signals and control hydraulic flow to the hydraulic cylinder based on the movement signals. The vibration signals can be complementary signals. The amplitude and/or frequency of the vibration signals can be adjustable.

An implement vibration system and method is disclosed that includes a vibration activation device; an electrohydraulic mechanism and a controller. The controller monitors the vibration activation device and sends movement signals to the electrohydraulic mechanism to control implement movement. When the vibration activation device is activated, the controller sends vibration signals to the electrohydraulic mechanism to cause the implement to vibrate. An operator control can send implement commands where the movement signals are based on the implement commands, and when vibration is activated the controller can superimpose the vibration signals on the movement signals. The vibration signals can cause a hydraulic cylinder to repeatedly extend and retract. An electrohydraulic control valve can receive the movement signals and control hydraulic flow to the hydraulic cylinder based on the movement signals. The vibration signals can be complementary signals. The amplitude and/or frequency of the vibration signals can be adjustable.

Aspects of the subject disclosure may include, for example, a system for detecting an accumulation of a liquid on a transmission medium that may interfere with the propagation of guided electromagnetic waves on a surface of the transmission medium, and directing a device to remove at least a portion of the liquid accumulating on the surface of the transmission medium to mitigate the interference. Other embodiments are disclosed.

Aspects of the subject disclosure may include, for example, a system for detecting an accumulation of a liquid on a transmission medium that may interfere with the propagation of guided electromagnetic waves on a surface of the transmission medium, and directing a device to remove at least a portion of the liquid accumulating on the surface of the transmission medium to mitigate the interference. Other embodiments are disclosed.

A three-dimensional hydraulic oscillator includes an upper casing, a lower casing screwed with the upper casing, an upper joint screwed with the upper casing, a lower joint screwed with the lower casing and a screw. An upper rotating shaft is mounted in the upper casing. A turbine group is mounted on the upper rotating shaft. An upper cam is fixed to the upper rotating shaft. A lower cam is movably mounted in the upper casing. The upper cam contacts with the lower cam. The screw is mounted in the upper casing and fixed to the lower cam. A lower rotating shaft is mounted in the lower casing. An eccentric block is fixed on the lower rotating shaft. A lower roulette is fixed to the lower rotating shaft. A shaft cap is disposed above the lower roulette. An upper roulette is mounted on the screw and meshed with the lower roulette.

A three-dimensional hydraulic oscillator includes an upper casing, a lower casing screwed with the upper casing, an upper joint screwed with the upper casing, a lower joint screwed with the lower casing and a screw. An upper rotating shaft is mounted in the upper casing. A turbine group is mounted on the upper rotating shaft. An upper cam is fixed to the upper rotating shaft. A lower cam is movably mounted in the upper casing. The upper cam contacts with the lower cam. The screw is mounted in the upper casing and fixed to the lower cam. A lower rotating shaft is mounted in the lower casing. An eccentric block is fixed on the lower rotating shaft. A lower roulette is fixed to the lower rotating shaft. A shaft cap is disposed above the lower roulette. An upper roulette is mounted on the screw and meshed with the lower roulette.

An actuator system configured to generate a haptic effect is provided. The actuator system includes a cavity configured to store an incompressible fluid, the cavity being disposed within a first substrate, a piezoelectric actuator disposed within a second substrate, and a diaphragm disposed between the cavity of the first substrate and the piezoelectric actuator of the second substrate.

A pile driving adapter includes an upper attachment portion for selectively attaching the adapter to a drill head and a lower housing portion including at least a first outer wall. The pile driving adapter further includes at least one actuator including a first portion slidably mounted to the lower housing portion and a second portion configured to expand from the first portion in a direction perpendicular to the first outer wall. The first portion may be slidably mounted to the lower housing portion via a sliding mount, and the lower housing portion may include at least one elongate slot for receiving at least a portion of the sliding mount. The pile driving adapter advantageously couples the drill head and the member to be driven so as to reliably transfer sonic energy.